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In this letter, we investigate diffusion-based molecular communication between two mobile nano-machines. We derive a closed-form expression for the first hitting time distribution by characterizing the motion of the information particles and the nano-machines via Brownian motion. We validate the derived expression through a particle-based simulation. For the information transfer we consider single...
The communication channels in many practical scenarios, e.g., in industrial indoor environments can be modeled through Rician fading. Such a channel is characterized by its mean pathloss and Rician K factor. The computation of these parameters is essential for optimum power allocation, especially for wireless sensor networks consisting of energy-constrained battery-driven nodes. The most promising...
Cooperative relaying may be used to improve the lifetime of a wireless sensor network and decrease the total transmit energy expenditure in a wireless sensor network where the nodes are constrained by limited energy and computational capabilities. In networks with no special relays, ordinary nodes can assist each other to deliver the messages of one another. Different methods to select the partner...
Cooperative communication uses spatial diversity to mitigate multipath fading. With an appropriate assignment of partners it also decreases the energy expenditure of the network. Together with optimum transmit power allocation, it is a useful technique to overcome the energy constraint problem in wireless sensor nodes. The calculation of optimum power in a Rician fading channel is a computationally...
Selection of an appropriate relaying partner can be used to increase the network lifetime of a wireless sensor network. In this paper, the effectiveness of cooperative relaying in an IEEE 802.15.4 compatible wireless sensor network is investigated. The worst link first coding gain-based partner selection algorithm is applied together with a transmit power level that fulfilled a given outage criterion...
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